This aspect was also current in certain Borg-Warner transmissions created through the fifties. It fell away from favor in subsequent decades as a consequence of i

A lock-up torque converter features a crafted-in locking clutch system. Once the transmission senses a certain velocity or engine RPM, the torque converter will utilize the clutch to lock in a very direct connection among the enter and output shafts for superior efficiency.

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This is the feature beyond what a simple fluid coupling provides, which often can match rotational velocity but would not multiply torque. Fluid-coupling–based torque converters also normally incorporate a lock-up purpose to rigidly pair enter and output and stay away from the efficiency lo